[morganvachon]

You can delete the button, and you can go into about:config, turn off switches and set strings to "null". But the code is baked in, and your work to disable it will likely be reversed with each Firefox update. There's nothing nefarious about the Pocket code in Firefox from what I've seen, but the service it connects your browser to is opaque, closed source, and the ToS is hostile and aggressive towards openness.

In short, it should have remained an extension.